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目的研究舌侧矫治中下颌第1磨牙近中移动过程,牙周膜厚度因素对牙齿及牙周组织应力和位移的影响。方法基于逆向工程技术的方法,分别建立牙周膜厚度为0.15、0.2、0.25、0.3、0.35 mm的等牙槽骨高度的牙齿—牙周膜—牙槽骨三维模型,在舌侧矫治中倾斜、旋转及整体移动载荷作用下,分析牙周膜、牙根及牙槽骨表面的应力和位移状况。结果由牙周膜厚度差异引起的牙周膜、牙根以及牙槽骨表面最大应力极大值与极小值之比分别为1.46、2.06、6.72,牙根、牙槽骨表面的最大位移极大值与极小值之比分别为1.65、1.50;对应不同的牙周膜厚度值,牙根及牙周组织最大应力部位在牙根、根分叉以及牙颈间变动。结论临床治疗中,应注意观察牙颈、根分叉以及牙根部位的变化,针对牙周膜厚度较小的患者,整体移动更有利于牙齿及牙周组织的健康。
Objective To study the effect of periodontal membrane thickness on the stress and displacement of tooth and periodontal tissue during lingual orthodontic treatment of the mandibular first molar. Methods Based on the reverse engineering technique, a three-dimensional model of tooth-periodontal ligament-alveolar bone with different height of alveolar bone with periodontal membrane thickness of 0.15, 0.2, 0.25, 0.3 and 0.35 mm was established respectively. , Rotation and overall moving load, the stress and displacement of periodontal ligament, root and alveolar bone were analyzed. Results The ratio of maximal stress maxima to minima on the surface of periodontal ligament, root and alveolar bone caused by the difference of periodontal ligament thickness were 1.46, 2.06 and 6.72 respectively. The maximal maximal displacement maxima of root and alveolar bone And the minimum ratio were 1.65,1.50; Corresponding to the different periodontal membrane thickness value, the root and periodontal tissue maximum stress in the root, root bifurcation and cervical interdental changes. Conclusion In clinical treatment, attention should be paid to the changes of the dental neck, root bifurcation and root. For patients with small periodontal ligament, the overall movement is more beneficial to the health of the teeth and periodontal tissues.